Lifting jack



May 2,2, 192s.

S. J. VESELY LIFTING JACK Filed April l2, 1926 WA: I

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Patented May 22,1928. i V l I I UNITEDSTATESPATENT OFFICE.,4

` d LSTANLEYV. J'. VESELY, 0F CEDAR RAPIDS, IOWA.

LIFTING JACK.

Application nled April 12, 1926. Serial No. 101,468.

r This invention relates to jacks for lifting twice as far as the coupler, considered `with heavy loads, being designed more'particularrespect to the base. i y ly for use in connection with motor vehicles.` The coupleris turned by a tubular mem- The object of the invention is to produce ber 2, hereafter referred to as the driver, a simple, easily operated and powerfuljack, which engages the coupler slidably but unel` stable and reliable in operatiomand having turnably. i Preferably the shank of the coua wide range `of vmovement and composed ple is angular in cross section (hexagonal in of compara-tively lfew parts. the drawing), and iitsslidably inside a .cor- The invention is fully disclosed in the derespondingbore in the driver. To facilitate l0 scription and claims following, reference the turning of the driver' it is provided with fr being had tothe accompanying drawing, in a bevel gear 9, as above mentioned. "L The whichzl drive-shaft is preferably inclined, as shown Fig. 1 is a side elevation of a jackembodyin Figs. l and; 2 for theconvenience of `the ing theinvention not quite fully extended., operator. To give the greatest possible er-` 16 the middle ,portion of the` jack being mainly tension of the jack, Adetermined y by the To in section. Fig. 2 is a central, vertical seclength of its several sections, theL bevel gear tion of the same fully collapsed. Fig. 3 is a should be at the eXtreme .lower endof the similar section of a modification in the strucdriver.` In the type lof jack shown in Figs. ture of the jack, partly extended. 1 and 2 there isno end-thrust on the driver,

A part of the` following description apthe entire weight being carried bythe post plies to Fig. 3, as well as Figs. l and 2. The and its screw-threaded connectingV parts. differences will be pointed out explicitly This makes the turning` of the driver easy, hereafter. Figs. l and 2 will be lfirst deand permits the use of the bevel gear ask an scribed in detail. auxiliary basalesupport, the wide gear tend` In the drawing the numeral 5 denotes a ing t0 prevent undue tipping 0f the lifting S() base, which should be provided with a bearlparts of the jack, sinceit runs on or close to ing 6 to carry a stub-shaft or spindle 7 the base. adapted for connection with an operating For many purposes the parts above de- `Wrench or the like turning device, not Shown, scribed make a complete, operative jack. In

80 A pinion 8 at the inner end 0f the Shaft enoperation the ram needs to be held from .QS

gages a bevel gear 9 forming a part of the turning (if it is to be screwed up, rather driving mechanism of the jack, as will apthan merely carried up by the coupler) but.

, pear presently. n ordinarily it is so held by the load it lifts. To the base is rigidly secured astil,screw Any tendency of the jack to tip or deect threaded post 10. Assumingr that the shaft 7 from a vertical line is counteracted by the 90 is to be turned clockwise for .ifting,thescrew rigid post and the screw connections of all thread of the post will be a left-hand screw, the parts eXtensible in the lifting operation. as shown. On this post is screwed a long` Such a jack would not be so convenient,in

.y tubular nut (practically as long as the post), many Ways, as the fully equipped jack, but itv 40 and expanded atthe upper end t0 form an would be entirely practical and operative. 95 externally threaded screw. This nut 11 and It is preferred, however, to provide means its head 11 serveer,l a screw Connection be. for preventing the turningof the ram, and tween the post and a concentrically disposed, also, in some degree, increase the rigidity of tubular, internally threaded member l2, the jack when fully extended. This in- 44;` which is the part of the jack directly applied cludes a sleeve 13, slidable, but unturnable 100 to the load, and for convenience will here# Onthe ram, and a guide 14 for the sleeve after be referred toV as the ram, and the forming a. rigid part of the base. A slot 13'L connecting nut as the coupler. In operation in the sleeve takes a stud l5 attached to the the ram is held `from turning, and as the ram.` A similar slot 14. takes a stud 16 atthreading of itslscrew is of the opposite tachedto the sleeve. `The upward movement 105 (right-hand) type, it is evident that the of the parts is limited by the engagement of turning of the coupler will elevate or dethe studs with the ends of the slots.

press the ram as it, (the coupler) runs up or The principle of the jack shown in Fig. 3 down on the post. `Assuming the pitch of is essentially the same as the other, but in i the threads to be the same, the ram( will move this case the driver is screw-threaded and 110 engages the lower, closed end of the sleeve, so that it is raised concurrent-ly with the con pler. `The characters r13 and Il@A are used to corresponding parts in Figs. 1 and-2,5; A ball bearing is shown for the driver 2, but any bearing will serve, as there is praetica'lty no end-thrust on the driver.

In the type of jack shown in Figs. 'l and 2 the eollapsinof ot' the parts is forced by the positions of-tie gears. In that shown in Fig 3 a bracket 17, serves the same purpose. aving thus described my invention, I claim: A

1. In a` lifting jack, threaded `post rigidly attached thereto, an internally and externally, oppositely threaded coupler engaging `the post, atubular ram screwing on said coupler, a tubular driver disposed relatively between the ram and the coupler Whenin collapsed position, and engaging the coupler slidably but unturnably,

the driver.

2. In a lifting jack, abase, ed post rigidly attached thereto, a tubular, internally threaded ram, a sleeve engaging thefram slidably but unturnably, a rigid guide to permit the endwise, but prevent rotary movement of the sleeve, a doubly and a screw-threads' distinguish this sleeve and coupler romtheW .threaded post rising a base, a screw-l f and means disposed at the base for turning oppositely screw-threaded coupler to engage both the ram and the post, and a driver engaging the coupler Slidably, but unturnably, and disposed between the coupler and the ram when the jack is collapsed. f

3. ln a lifting jack, a base, a rigid, shrewtherefrom, a tubular coupler screwing on said post, and having an expanded, oppositely threaded head, a tubular ram screwing on .Unid head, and a tubular driver disposed in the space between the ram and coupler when in collapsed position, and Yadapted to turn the coupler a?. said coupler slides in the driver.

4. In a lifting jack, a base, a rigid f-srrew threaded post rising therefrom. a coupler threaded to run on the post, and having an expanded head externally threaded. a tubw lar ram` threaded "to run on said head, an endwise movable member and adapted to prevent screw-threaded driver engaging said movable member by its screw thread, and slidably, but untnrnably engaging the eopler, and means adapted to turn the driver, .vhereby concurrent and positive movenient is imparted to the extensible parts.

1n testimony whereof l ailizf; my signature.

STANLEY J. vEsELr.

engaging the ram its turning., a 

